\Header{IGF}{Radioimmunoassay of IGF-I Protein}
\keyword{datasets}{IGF}
\begin{Description}\relax
The \code{IGF} data frame has 237 rows and 3 columns.\end{Description}
\begin{Format}\relax
This data frame contains the following columns:
\describe{
\item[Lot] an ordered factor giving the radioactive tracer lot.

\item[age] a numeric vector giving the age (in days) of the radioactive
tracer.

\item[conc] a numeric vector giving the estimated concentration of IGF-I
protein (ng/ml)

}\end{Format}
\begin{Details}\relax
Davidian and Giltinan (1995) describe data obtained during quality
control radioimmunoassays for ten different lots of radioactive
tracer used to calibrate the Insulin-like Growth Factor (IGF-I)
protein concentration measurements.\end{Details}
\begin{Source}\relax
Davidian, M. and Giltinan, D. M. (1995), \emph{Nonlinear Models for
Repeated Measurement Data},  Chapman and Hall, London.

Pinheiro, J. C. and Bates, D. M. (2000), \emph{Mixed-Effects Models in S
and S-PLUS}, Springer, New York.  (Appendix A.11)\end{Source}
\begin{Examples}
\begin{ExampleCode}
data(IGF)
\end{ExampleCode}
\end{Examples}

